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Statements of Income and Comprehensive Income (USD $)
 3 Months Ended 12 Months Ended
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Income                      
Interest Income $ 645,739 $ 768,957 $ 715,504 $ 821,372 $ 1,250,320 $ 1,311,627 $ 833,781 $ 761,733 $ 2,951,572 $ 4,157,461 $ 647,347
Total Income 645,739 768,957 715,504 821,372 1,250,320 1,311,627 833,781 761,733 2,951,572 4,157,461 647,347
Expenses                      
Sponsor's fee (518,100) (538,238) (570,566) (592,704) (875,488) (906,721) (644,850) (604,056) (2,219,608) (3,031,115) (2,366,977)
Total Expenses (518,100) (538,238) (570,566) (592,704) (875,488) (906,721) (644,850) (604,056) (2,219,608) (3,031,115) (2,366,977)
Net Income/(Loss) 127,639 230,719 144,938 228,668 374,832 404,906 188,931 157,677 731,964 1,126,346 (1,719,630)
Other Comprehensive Income/(Loss):                      
Currency translation adjustment (1,750) 3,499 917 4,138 3,000 5,665 4,928 718 6,804 14,311 (7,589)
Total Comprehensive Income/(Loss) $ 125,889 $ 234,218 $ 145,855 $ 232,806 $ 377,832 $ 410,571 $ 193,859 $ 158,395 $ 738,768 $ 1,140,657 $ (1,727,219)
Basic and Diluted Earnings per Share $ 0.03 $ 0.04 $ 0.03 $ 0.04 $ 0.04 $ 0.05 $ 0.03 $ 0.03 $ 0.13 $ 0.15 $ (0.28)
Weighted-average Shares Outstanding 5,099,457 5,448,913 5,791,111 6,030,435 8,624,457 8,848,370 6,531,461 6,064,674 5,591,393 7,525,342 6,171,233
Cash Dividends per Share $ 0.03 $ 0.04 $ 0.03 $ 0.05 $ 0.05 $ 0.04 $ 0.03 $ 0.02 $ 0.14 $ 0.14 $ 0